Machine for twisting metal bars.



PATENTED JULY 10, 1906.

P. BLOIVDBLL.

MACHINE FOB. TWIESING METAL BARS.

APPLIGATIOH FILED 001220. 1904.

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Jfirnegm N0- B25,511. PATENTBD JULY 10, 1906.

P. BLONDBLL.

mamas FOR TWISTING METAL BARS.

APPLIOATIOI FILED OUTJO, 1904.

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UNITED STATES PALIEENT OFFICE.

PETER BLONDELL, OF TONAWANDA, NEW YORK.

MACHlNE FOR TWISTlNG METAL BARS.

Specification of Letters Patent.

Patented July 10, 1906.

Application filed October 20, 1904. Serial No. 229.332-

useful Improvements in Machines for Twist" ing Metal Bars, of which the following is a specification.

This invention relates to machines for twisting metal bars for use in concrete and similar construction work. Heretofore inthe manufacture of these bars they were rolled in a metal-rolling machine, then cooled and straightened, and next taken to a shearing-maclnne and cut to the desired lengths, after which the bars were twisted when in a cold state. By this method the twist is made very irregular ,and the bar is bulged out of atrue line, requiring further treat ment to straighten the same after being twisted.

I am aware that efforts have been made to heat a bar by electric heat and then twisted, and also that an efiort has been made to pass the hot bar through a spiral die as it leaves the rolling-machine, but without success.

The ob ect of my invention is to provide a machine 1n which the metal bars are delivered from the metal-rolling machines onto the hotbed and there twisted before being cooled, and also in providing improved means for holding the ends of the bars and for twisting the latter.

To this end the invention consists in the construction, arrangement, and combination of parts to be hereinafter described, and particularly pointed out in the appended claims.

In the drawings, Figure 1 is a broken sectional elevation of my improved machine. Fig. 2 is a central longitudinal section through the hotbed, showing one end of the 7 several twisted bar clamped thereon and the rev'olnble chuck in which the other end of thebar is held. Fig. 3. is a top plan view of the hotbed, showing the bar and the lever for locking the same to the hotbed. Fig. 4 is a transverse section throu h the hotbed taken on line 4 4, Fig. 3. i 5 is a central longitudinal section throu the chuck. Fi 6 is a section on line 6 6,%ig. 5.

eferring to the dra s in detail, like letters ofif reference refer to like parts in the res. The lo ger A designates the rolls of a rolling-machine by which the metal is rolled into the desired form of bar.

B designates the hotbed, usually rovided to'cool the bars as they lie thereons ter leaving the rollin -machine. lhis hotbed comprises a suitab e frame C and a grate or openwork bed D, herein shown as consisting of longitudinal bars :2 and transverse bars :1,

formed in one integral piece and being of rectangular formation.

Adjoining the hotbed is a suitable support E, carrying bearin s F, in which a divided shaft G is ]0I1I113.l6 Said shaft has a suitable clutch H, by means of which the two parts thereofare connected, one art, h, of the clutch being fixed to the end 0 one part of the shaft and the other part, h, of the clutch being held slidably on the other art of the shaft. by the clutch may be coupled, as is common, to cause the two arts of the shalt to revolve together. The s aft may be revolved in any practicable manner.

To the endo? the shaft adjacent the hotbed a chuck J is affixed, consisting'of 8. rectangular casing K, having a removable side is and grooves L in the inner faces of the three rigid sides. In these grooves a rectangular plate M is seated and held in the chuck by the removable side, which is bolted to the rigid sides by bolts N. The chuck-plate M is provided centrally with a square aperture 117:. into which one end of the bar 0 to be twists is inserted. It is of course understood that bars of different cross-sections may be tWiSted and in such cases the opening in the chuck-plate conforms to the section of the bars. The op osite end of the bar 0 is locked to the otbed against turning by a lockdever P. This lever has its locking end A suitable lever I is provi ed, wherecurved downward, as at p, to pass between two longitudinal bars d of the hotbed and terminates in a toe which lies underneath one of said longitu inal bars. The extremity of said toe is provided'with a lip 19*, which lies against the side of the last-mentioned bar, and thus the lock-lever is locked on the hotbed. This lever lies on the hotbed and has its under side rovided with a square socket R into which file end of the bar to be twisted is held. The free end of the lever gro'eots beyond the side edge of the hot e and is manually held against upward movement,

7 but, if desired, may be otherwise held in this position. Said lever may be engaged with the hotbed at any point in the length thereof, depending on the length of the bar to be twisted. It is therefore apparent that with one end of the bar locked on the hotbed against revolving and the other end secured in the revolving chuck the bar is twisted on the hotbed while hot and directly after passing through the forming-rolls, thus saving time and labor.

During the twisting of the bar that end thereof which is held. in the clutch is free to move lengthwise in the opening in the chuckplate. This permits said end to be drawn out during the act of twisting the bar, which assures twisting of the bar without the possibility of flexing the same, thus rendering the roduct of the machine perfect and dispensmg with the work heretofore required to straighten the bars after being twisted.

Having thus described my invention, what I claim is- 1. The combination of the hotbed, means for locking one end of the bar to be twisted to the hotbed a revoluble shaft, and a chuck comprising a rectangular casing having a removable side and a chuck-plate having an aperture therein for the reception of the opposite end of the bar.

2. The combination of the hotbed, means for locking one end of the bar to be twisted to the hotbed, a revoluble shaft, and a chuck comprising a rectangular casing having a removable side and a chuck-plate having an aperture therein for the reception of the o posite end of the bar, said aperture being ol' a shape to prevent turning of the bar while permitting engthwise movement of the same therein.

3. The combination of, the hotbed formed of U]')GI1W()Il( material ,a revoluble shaft, a chuck secured to said shaft in which one end of the bar to be twisted is held, and a lock-lever having one end thereof held to the bars forming the open-work hotbed and serving to hold the opposite end of the bar against turning on the hotbed.

4. The combination of the hotbed consisting of bars disposed in different directions to form openings, a revoluble shaft, a chuck on said shaft into which one end of a bar to be twisted is inserted, a lock-lever having a downwardly-bent end passing through one of said openings and terminating in a toe adapted to lie underneath one of said bars, said lever having also a socket on its under side in which the opposite end of the bar to be twisted is held.

5. The combination of the hotbed consisting of bars disposed in different directions to form 0 enings, a revoluble shaft, a chuck on said s aft into which one end of a bar to be twisted is inserted, a loeklever having a downwardly-bent end passing through one of said openings and terminating in a toe with an upturned lip adapted to embrace one of said bars, said lever having also a socket on its under side in which the opposite end of the bar to be twisted is held.

In testimony whereof I have aifixed my signature in the presence of two subscribing witnesses.

7 PETER BLONDELL. Witnesses R. E. ERDMAN,

EMIL NEUHART. 

